PDF malware analysis — malicious · 9c349b0771a2fffb

MALICIOUS

PDF

75.7 KB Created: 2021-09-26 00:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: f3a6969056b8256fd3932c6cf851fc9a SHA-1: 95d57c931ef6c969019d6c5f15c35971aa8defde SHA-256: 9c349b0771a2fffb4c9e5f348a7d7f31ac726c39d74b1bb27ee53e58fc5bf32d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm on disposable hosting, and multiple external URIs were extracted, pointing to suspicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://allytemp.ru/uplcv?utm_term=emulator+android+iphone PDF link annotation
- https://birudongker.com/contents/files/65133194523.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/cd9c7c9e8c5157f1eb8699a613cbcd42/rexesofejavabaxuzu.pdfIn PDF document text
- https://tahubunting1.com/contents/files/vanikuf.pdfIn PDF document text
- https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/12032617924.pdfIn PDF document text
- http://grandrosso.com/js/upload/files/fivegarodudogujezefoku.pdfIn PDF document text
- https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/nolimodufuxukajabifax.pdfIn PDF document text
- http://chochosanencino.com/uploads/files/xedinekixiputuzu.pdfIn PDF document text
- http://kovospm.cz/fotky/file/logixi.pdfIn PDF document text
- http://studiosantese.eu/userfiles/files/paxamivaxabobulosodul.pdfIn PDF document text
- http://blfimmobiliare.com/userfiles/files/41059648924.pdfIn PDF document text
- http://kientrucnhacuagio.com/upload/files/talibadotopimonesu.pdfIn PDF document text
- https://wemservice.com/ckfinder/userfiles/files/95108295894.pdfIn PDF document text
- https://o2opr.co/userfiles/files/88579623311.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e529362de4---54203577172.pdfIn PDF document text
- http://galerie45.com/userfiles/file/84039815562.pdfIn PDF document text
- http://rcsiprojectracker.com/userfiles/files/78745052665.pdfIn PDF document text
- http://slesnick.net/userfiles/files/23345117679.pdfIn PDF document text
- https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/84898800520.pdfIn PDF document text
- https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/96315246408.pdfIn PDF document text
- http://ph-easycome.com/userfiles/file/kobovamevulaguna.pdfIn PDF document text
- https://mumegram.com/userfiles/file/47601326689.pdfIn PDF document text
- http://cuboni.com/uploadfile/hong202109080414488222.pdfIn PDF document text
- http://bisenzia.it/userfiles/files/suzodisekazerixojasibesu.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bb52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d369.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD369	10572 bytes
SHA-256: `a4a66ef524457e8262f061a4890c481664950eb41966c6dff925f64982d634b6`
`font_02_sfnt_off0000eb36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB36	21120 bytes
SHA-256: `06f192d1c8a8a774ff7b9d37631fbd204ae812097b92c84ba6139be4008787cf`

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